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Cloning and sequence of cDNA coding for alpha 1-antitrypsin
Summary
Researchers identified baboon alpha 1-antitrypsin cDNA, revealing over 96% homology with human sequences. This major serine protease inhibitor
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Alpha 1-antitrypsin is a key serine protease inhibitor found in blood.
- Recombinant DNA technology allows for the study of protein-coding sequences.
Purpose of the Study:
- To screen recombinant plasmids for alpha 1-antitrypsin (AAT) cDNA from human and baboon sources.
- To characterize the cDNA sequences and compare the deduced amino acid sequences.
Main Methods:
- Screening of recombinant plasmids containing human and baboon cDNA.
- DNA sequencing of identified cDNA inserts.
- Amino acid sequence comparison using computational methods.
Main Results:
- A baboon AAT cDNA insert (pBa alpha 1a2) of 1352 base pairs was identified, coding for a mature protein of 394 amino acids.
- A human AAT cDNA insert (pH alpha 1a1) of 306 base pairs was identified, coding for the carboxyl-terminal region.
- Baboon and human AAT amino acid sequences showed >96% homology.
- Homology of ~30% was found between baboon AAT, human antithrombin III, and chicken ovalbumin.
Conclusions:
- The study successfully isolated and characterized cDNA for baboon alpha 1-antitrypsin.
- High sequence homology between human and baboon AAT suggests conserved function.
- Comparative analysis provides insights into the evolutionary relationships of serine protease inhibitors.